Can a speaker just die?

I recently acquired a ProAc Super Tablette.  I used them for a few weeks and swapped them out with something else (Vandersteen 3A Sigs - yep, from a speaker the size of a pack of smokes to the large floor standers).  I was just curious to see if I could get the Vandys to work in my small listening room (12x16).  

I missed the holographinc imaging the ProAcs provide so decided to swap back.  But one speaker is now not working.  Zero sound.

Was working fine when I swapped them out a week or so ago.  Thought maybe amp went out, or cables so I swapped them around and still no sound.

Any idea what could have happened?

Thanks, and stay safe.